Thread-drawing machine.



v W. H. MCIVIURRAY. THREAD DRAWING MACHINE. APPLICATION FILED DEC. 28,191.5.

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W. H.. MCMURRAY.

THREAD DRAWING MACHINE.

APPLICATION FILEUDEC. 28. 1915.

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W. R. IVICIVIURRAY.

THREAD DRAWING MACHINE.

APPLICATION FILED DEC. 28, 1915.

Patented Aug. 21, 1917.

4 SHEETS -SYHEET 3.

WVM/5 5.5.5:

W. R. MCIVIURRAY.

THREAD UBAWING MACHINE.

APPLICATION FILED DEC. 28 1915.

Patented Aug. 21, 1917.

4 SHEETS-SHEET 4.

INVENTOR ATTORNEYS in e .sans

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To n.7] whom t may concern: i

lie it known that I," WiLLiAM R101-Inv Mcli'lnnnar, a subject oftlieKing of Great Britain and Ireland, residingk at Belfast, Ireland,haveii'ivented certain new and useful Improvements in and relating to`Thread- Drawing lrlachines, of which the following is a. specification.

This invention relates to machines for removing threads fromfabriepreparatory to the production of open work effects as required forLsliire andvthe like sewing and it specially relates to machines ofthisclass in which the threads, or portions of the threads, to beremoved are pushed downward and the portions `projecting below thefabric then cut off.

As is usual inthe known typesof thread removingl machines, the threads,which are to be removed," are pushed downward by means of a verticallyvreciprocating serrated edged pusher and I, preferably, employ the usualneedle bar mechanismof a sewing machine for operating same.

The invention consists in providing improved presser foot andfabricholding and stretching devices, consisting of a cloth plate having oneor more upward projections, for example. bars or rails, on each side ofthe cloth plate and lying in ther direction of the feed ofthe fabric andadaptcdt'o engage a corresporidingl recess or `recesses at the undersideof the presser foot. 0r the recesses may be provided in the cloth plateand the projections for engagement ywith thelrecesses be provided on theunderside ofthe presser foot. In either case, the arrangement is suchthat, on. the pressing downward 'ofLA the presser foot, the fabricunderneath is held and stretched during the thread cutting operation,`owing tothe fabric being grippedv between the projections and theyrecesses in the cloth plate and presser foot respectively; or, in thepresser foot and cloth plate, respectively, as the case may be. I alsoprovide an improved thread cutter which consists of a. swinging` oroscillating knife suitably supported underneath the cloth plate andwhich can be operated by link and lever or equivalent mechanism actuatedfrom one or other of the ordinary oscillating feed shafts of a sewingmachine, the oscillating knife being thereby moved across the undersideof a hole in the cloth plate through which the threads are pushed by theverti- 1 cally reciprocating pusher. Preferably, the

l Specification of Letters Patent.

v THREAD-DRAWING MACHINE.

underside of the cloth plate would be so made, and the oscillating knifeso made and set, that the latter would bear more or less resilientlyagainst the underside of thecloth Patented Aug. 21,1917.

' Application filed December 28, 1915. Serial No. 68,999.

plate in order to insure the knife cutting the threads as closely aspossible to the underside of the fabric.

If desired I may provide means for drawing off the fluff or cuttings ofthe threads from below the machine.

In order that the invention may be clearly understood I have hereuntoappended three explanatory sheets of drawings whereon I have shown, byway of example, a thread removing machine made in accordance ywithV theinvention. w

Figure l is a side elevation of the machine, portions of the base androcking shaft mechanism being removed to clearly show the thread cutterand its connections.

Fig. 2 is a plan view of the machine with the head and presser foot andcloth plate removed t0 show the thread cutter andy cloth feedingmechanism.

3 is a front end elevation of the machine. f

Figs. t, 5 and 6 are detail views showing the cloth plate, presser foot,and thread cutter, in position.

Figs. 7, 8 and 9 are detail views showing an alternative arrangement tothat shown at Figs. 1 to 6.

Fig. l0 is a detail view corresponding to Fig. 5 but showing projectingbars or rails on the presser foot engaging recesses or grooves in thework plate.

" On the drawings the same reference letters, wherever repeated,indicate the same parts.

- Referring to the drawings The machine may be made with operativemechanism similar to thatof an ordinary hem-stitch sewing machine or itmay be constituted by a hemstitch sewing machine whose parts are alteredto suit. Themachine shown is a hemstitch sewing machine of the Wheeler &Wvilson type but with the shuttle mechanism removed and instead ofhaving a needle, a serrated edged pusher is attached to the needle bar.The dotted lines in the arm of the machine indicate theusual sewingmachine mechanism for operating the needle bar while the usual feedshaft,

drop feed motion and rock bar feed shaft are shown under the bed plateof the machine.

f foot and .cloth plate.

Each time the needlev bar is moved downward the pusher a pushes .orforces the threads downward through a hole b3 in the cloth plate Z) ofthe machine, whereupon ythe threads are cut and removed by a swingingyor oscillatingkni-fec which is adyustably supported on alever c1fulcrumed at c2 andy oscillated from the rock bar d of the drop feedmotion of the machine through the medium l.of 4a lever Z1-.and link d2connected to the lower end of the lever c1. rfhe ,movement could also,if desired, ybe obtained from the rockbar feed vshaft e of the machine,

described by vthe knife andy in order to bring the knife, as near aspossible to the under'- side `of the clothon thecloth plate, it may beso set4 that its cutting edge bears either stiifly or resilientlyagainst the curved ,underside of the cloth plate. Thecloth is held andstretched, during the cutting of the threads, by the cooperation of thepresser. For this purpose the presser foot of the machine isprofvidedwith ltwo recesses f1 ,and f2 adapted torengage corresponding projectingbars or rails b1' .and b2, see ,awo-,n the upper side of the clothplateZ) .so ithat,when the foot is pressed down, the fabric between it andthe.cloth plate Z) will be securely held and stretched by the clampingaction of the recesses and projections on the presserfoot .and .clothplate respectively. Fig. l0 shows `the prolections on fthe presser footand the recesses in thecloth plate. This clamping action yentirelyprevents sidev vplay ,of the cloth or fabricluring the .cutting of the(threads and insures .a clean `Land regular shiring lof the cloth orfabric. y

The fluff or cuttings of the threads may be Y drawn away from below themachine by `means vof anali' suction lapparatus arranged ".collected.The suction apparatus which maybe in the form 0f an air pump may beoperated from, or by, the machine mechanism or it maybe yindependentlydriven. If desired, a lnumber of machines may be v vconnected vto acommon extractor.

Having now :fully described my invention,

what fclaim'anddesire to secure .by Letters Patent is v v 1 A `machinefor removing threads from fabric having a cloth plate lwith a hole vtherein,.a pusheror displacing threads from `the fabric Jand pushingthem through said hole, means for Ioperating the pusher, an oscillatingycutting knife working across the underside of thecloth plate below .thevhole .therein and so as to cut the threads displaced by the pusher, andmeans comprising a' presser foot with recesses on the underside thereofand a cloth plate with projections on the upper side thereof, thepresser foot vand cloth plate being adapted to cooperate to hold andstretch the fabric.

2. A machinev for removing threads from fabric, having oscillating feedshafts, a cloth plate with a hole therein, av pusher for .displacingthreads from the fabric and push-ing them through said hole, means for,operating the pusher, an `oscillating cutting knife work- `lllg across.the .underside of the cloth plate below the vhole therein and so as tocut the threads displaced `by the pusher, link yand lever mechanism, forAoperating the knife, actuated from one of the oscillating feed shafts,and means for holding and stretching the fabric .during the threadcutting operation.

ln testimony whereof I affix my signature in presence of two witnesses.

f WILLIAM RICHEY. MCMURRAY. lfiitnesses GnorGnC. Snrvnns,

Francis FARRELL.

Soapies kof thslpatent lmaybe robtained. for kvfive cents each, byaddressing the Commissioner or-Patents.

Washington, D, C. n l

